Bronco offers OEM replacement valves for both ATV and UTV models. OEM replacement valves are made of durable SUH35B heat resistant steel that also comes with a fill Nitride finish for further durability and resistance to corrosion Performance valves receive a swirl polish, smooth stem treatment, and are made of 21-4N/SUH35HT stainless steel. Performance valves are generally reserved for high-performance/revving machines so these valves are forged with Stellite-Tipped valve stems All valves are manufactured under ISO 9001 certified factory